我是Swift和Firebase的新用户。我正在尝试使用Facebook登录名创建应用程序。我已经实现了一些代码并尝试学习本教程,但我并不真正了解如何登录可以保存和“知道”当前用户数据。所以我试图实现的登录方法此代码并保存用户ID
NSUserDefaults.standardUserDefaults().setValue(result ["uid"], forKey: "uid")
Facebook登录和当前用户的Firebase和Swift
这:
var REF_USER_CURRENT: Firebase {
let userID = NSUserDefaults.standardUserDefaults().valueForKey("uid") as! String
let currentUser = Firebase(url: "\(baseUrl)").childByAppendingPath("users").childByAppendingPath(userID)
return currentUser!
}
登录它会移动到其他视图,并显示在用户名后。我用这个代码来检索用户名数据
func displayName() {
FirebaseHelper.fbh.REF_USER_CURRENT.observeEventType(.Value, withBlock: {
snapshot in
let currentUser = snapshot.value.objectForKey("name") as! String
self.currentUsername = currentUser
self.facebookUserName.text = currentUser as String
print("Username: \(currentUser)")
}, withCancelBlock: { error in
print(error.description)
})
}
但是,每次我登录,它会显示这个错误致命错误时间:意外发现零,同时展开与彰显REF_USER_CURRENT一个可选值。我认为这是因为它无法在NSUserDefault中保存uid。这是我的登录方法
func loginButton(loginButton: FBSDKLoginButton!, didCompleteWithResult result: FBSDKLoginManagerLoginResult!, error: NSError!) {
if error != nil{
print("Facebook login failed. Error \(error)")
}else if result.isCancelled {
print("Facebook login was cancelled")
}else if result.grantedPermissions.contains("email"){
let accessToken = FBSDKAccessToken.currentAccessToken().tokenString
FirebaseHelper.fbh.REF_BASE.authWithOAuthProvider("facebook", token: accessToken, withCompletionBlock: { error, authData in
if(error != nil){
print("Login failed. \(error)")
}else{
print("Logged in! \(authData)")
self.saveUserToFirebase(authData)
print("User Saved Successfully! \(authData.uid)")
self.processLogin(accessToken, authData: authData)
let viewController:UIViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("profileSetup") as! UIViewController
self.presentViewController(viewController, animated: true, completion: nil)
}
})
}
}
func processLogin(accessToken: String, authData: FAuthData) {
FirebaseHelper.fbh.REF_USER_CURRENT.childByAppendingPath(authData.uid).observeSingleEventOfType(.Value, withBlock: { snapshot in
if snapshot.value is NSNull {
print("fail")
} else {
print("no")
}
})
}
private func createUser(authData: FAuthData!){
let displayName = authData.providerData["displayName"] as! String
let email = authData.providerData["email"] as! String
var imageUrl = ""
if let url = authData.providerData["profileImageURL"] as? String {
imageUrl = url
}
let request = FBSDKGraphRequest(graphPath: "me/picture", parameters: ["fields": "url", "redirect": false, "type": "large"], HTTPMethod: nil)
request.startWithCompletionHandler { connection, result, facebookerror in
if facebookerror != nil{
print("Graph API Call failed. \(facebookerror)")
}else{
//let userData = (result as! NSDictionary).copy()
let user = ["name": displayName, "email": email,"profilePicUrl": imageUrl]
FirebaseHelper.fbh.createFirebaseUser(authData.uid, user: user)
if facebookerror != nil{
print("Error occured! \(facebookerror)")
}else{
print("User Saved Successfully! \(authData.uid) \(displayName)")
NSUserDefaults.standardUserDefaults().setValue(result ["uid"], forKey: "uid")
}
self.facebookLoginBtn.hidden = true
}
}
}
我不明白NSUserdafult如何将当前用户的工作,我需要编写任何代码的每一页,检查当前用户数据检索数据?请修改我的代码以获得对此问题的更多理解。